Wednesday, January 30, 2013

Vidyasagar Setu at Night

Vidyasagar Setu. A cable stayed bridge is a bridge type suspended in which the deck is supported by a series of cables the head stays anchored to pylons or towers support. Compared to a suspension bridge of conventional type, in which the deck is in fact suspended by hangers to the vertical load-bearing cables that take the form very similar to a parabola, the stays of cable-stayed bridge connecting directly to the floor of the deck to the towers and assume a form apparently rectilinear.

The cable-stayed bridges are considered as the ideal solution to overcome the medium and large spans of up to over a thousand meters. In order to avoid too large for the thickness of the girder, is therefore the same type of cable-stayed, and therefore functions primarily as arc reticular three hinges upside down. The mooring system of the suspension is formed by two struts inclined slightly towards the accesses and backward with respect to the taxes of the girder, from the top part of which a double order of Forestays confluent on the girder. The mooring outside of the pylons was provided at 65 m distance from each of them.

The idea of supporting a beam with inclined ropes, the stays , is ancient: the medieval drawbridges and, much earlier, the peaks of the Egyptian ships, are an example. The first applications of this system in the construction of bridges, appeared since the XVII and XIX, respectively.

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